And it's me again, I checked the supply, it is 4.99V, that is not too bad. I adjusted that in my calculation and got 0.3215 V / Bit.
The multiplication works fine. I do not know what was wrong before, now the voltmeter is accurate to 1V (as compared to my 40EUR multimeter). I know, that is not really very good, it is a little below the ADCs resolution, but I guess with standard .25W 5% resistors and a not too crappy supply it is quite OK. In my "real" voltmeter I will use the internal reference as well as high precision .1% resistors. Since I measured the resistors in- circuit, the resistor's respective accuracy should not be the problem, though... Hmm. How could I increase the accuracy then (except with the internal ref)? Maybe chose resistors with a low TC? Jens -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
